Hey I was wondering what i should do to get better milliage b/c Im barely getting 199 miles per tank!! Please help

 

Check :

o2 sensor ====> gives you the worst MPG if not working.
air filter
spark plugs

 

I have changed spark plugs, PCV valve, air filter, fuel filter, and cleaned throttle body

 

O2 sensor

have you checked that yet it will rob you soo much on gas mileage

 

ok thanks i'll try that, but if anyone else has ideas please help

 

dude, you changed just about everything else...maybe your knock sensor? I would definitely replace the 02 sensor first.

 

Is there a clear way to tell its defective? When i did my Ypipe it looked as if it's fine but my car doesnt get great mileage either.

 

oxygen sensor!! those things are expensive as f'### though

 

they are like $80-$90 IIRC (ask Internetautomart for a good price). I have a VE, but I think the VG o2 sensors are the same.

That's really not that expensive. Think of it like this -- I got 25+ mpg last time I calculated my mpg. That's about 400 miles on most of a tank (say 16 gallons roughly), since I don't run it down to zero. If you are getting 1/2 that, you are getting roughly 12.5 mpg. If you go through 2.5 tanks of gas, you will save around $80 (at $2/gallon). So, if it solves the problem, you will save your money back in about 1000 miles.

 

calculate before/after mileage with the fidanza and let me know how many miles it will take for it to pay for itself. It would be impossible for me to lol

 

Hi,

here the price of the o2 sensor that internetautomart is selling for the vg and ve engine,

Oxygen Sensor

90-94 ALL KEM 138-580 $69
89 ALL KEM 138-345 $59
90-94 ALL Bosch 13387 $62
89 ALL Bosch 13388 $57.50
90-94 ALL NTK 24064 $55
89 ALL NTK 24004 $57.50

 

I haven't had a normal driving trip since I've had it. On the way back from your house after the install, I was well over the speed limit (bad, Chris!) and the last trip I took was to Woodburn, where I raced it, which I am sure didn't help the mpg. I didn't check mileage going to Woodburn. I tried to judge it so I had only around 1/3 of a tank when I raced it. I would have gone lower, but I had no idea how many runs or how far the track was from the nearest gas station.

See, it's cheaper than I recalled, so it's even less to save your money.

 

how many O2 sensors do our cars have 1 or 2? B/c i know some cars have more than 1

 

i knew somethin was fukked up when i got 80 miles a HALF OF A TANK. What I did didn't use any money, but I started accelerating slower and right now I have 55 miles and only used 1/8. So I figured I was pushing my old car too hard and laid off, and the whole car responded better, even the tranny.

 

if u tuned up ur car and checked the ex. for leaks,then ur o2 is bad or old..they all look the same when u drop it out.y dont u get an air/fuel gauge..im buying an o2 this week cause i get the same 190-210 character.by the way where do i tap/solder the o2 line?any post here for that..at least it will tell u whether ur running rich.i also tried the light foot treatment

 

I got and o2 sensor today at napap for 90 bucks. BOsch. The cord is 3FT LONG! compare to the 12 inch stock one.

Should I cut it shorter for better repsonse?

 

i would..be sure to soldier the connection not tape..r u sure u got the right one?

 

what brand will fit direct then?

 

Bosch does use a rather long wire on it's o2 but most others are the shorter more normal length.

 

do the kem/ntk have the correct size so we can plug and play

 

yes they do

 

hey hotazzmax, i saw the rims you are lookin for on ebay for 320 the other day, check there again, im sure someone is upgrading those things to spinners and wanting to get rid of them.

 

what rims..can u share the wealth?im looking at the cobras in gunmetal for 400w/ tires

 

Uh... no, it's 50 bucks for a brand new OEM NTK O2 Sensor straight from NGK.com

 

Put in the o2, still sucking down on premium. Fill it, and after 100 miles of city driving it's at half... I'm now curled up in a ball in the corner crying and confused... And yes i have a wireless keyboard so i can type this from the corner.

It's gotta be a bad AAC adjustment ay???

 

CALM DOWN
When my gas mileage went it took the new O2 and about a week of normal driving for the car to get the gas mileage back. If it's been running like crap for a while you might want to reset the ECU. It couldn't hurt. Then drive normally. I would fill up to a quarter of a tank and measure how many miles I got. If the number doesn't go up gradually then you can curl up into a ball. I felt the pain before man. Check my ride!!!

Also you could always try seafoam, or BG44K.

 

Hmmmmm.... Reset the ECU(Thinks*: Can I do that with a pen???)

I know my aac is messed up. I took it to a garage and he said "WTF!? that AAC screw is turned down 1/4 inch to far... I think?" I can't find anyone that knows anything about aac adjustment.

 

I changed a lot of parts on my 91 SE due to bad gas mileage. Once I changed the O2 sensor though, I got 250 miles a tank as opposed to 200. Then I changed the fuel injectors and I then got 350 a tank. Then I replaced the clogged cat converter, now I get 370 a tank. I am pretty satisfied now.

 

holy crap.

 

to therealgoon9 :

If you think your IAAC needs adjustment, then warm up your car. Put it in park and your RPM should be around 750. If not, then you need adjustment. Bad mileage is one hell of a mystery for me to decypher lately. I am having the same problem. I couldn't believed one dude claimed he got back his spec after changing his injectors. I did that, changed all flex fuel hose, rubber seals, orings, rotor, ngk iridium spark plugs, o2, down pipe, new cat, spark wires, bosch alternator, water pump, thermostat, t-belt, tires, rims, struts, springs, cleaned all intake carbon deposits, new vac hoses, rebuilted all injectors, etc.... shiiite and it still didn't do jack to improve my fuel economy.

I just installed 2 additional ground wires for the engine, so let's see if that does anything. I'd noticed smoother operation. Along with other mods and upgrades, it did helped out my performance a lot. So, I am keeping my finger cross as usual on my epic journey toward solving this damn bad gas mileage dilemma. Hell, if this one improves it. I am gonna ground every single f*** one of those 11 screws around the manifold!!!!!!!

 

rebuilt injectors

 

I'd get news. But I gotta eat. I think i put in 3grand this past 2 months.

 

so much bad info on this thread.